This guide walks through grip / road-racing tune basics in the Forza Horizon series, using the same methodology framework as our drift guide. Today is 2026-05-14 and Forza Horizon 6 launches 2026-05-19, so all numeric ranges below come from well-documented FH5 and Forza Motorsport (2023) tuning — treat exact FH6 values as unconfirmed as of May 2026 until the community confirms them post-launch. Use this as a starting baseline, then iterate on telemetry.
Key Facts
| Setting | Value |
|---|---|
| Primary use case | S1/S2 road racing, A-class circuit, B-class touge runs |
| Warm tire pressure target | 32–34 PSI warm (ForzaTune baseline) |
| DiamondLobby tire pressure | 20–25 PSI cold for max grip on road — unconfirmed as of May 2026 which FH6 will favor |
| Camber front baseline | -1.5 to -1.8 front, slightly less at rear |
| Toe baseline | 0.1–0.2 toe out front, 0 to -0.1 toe in rear |
| Caster baseline | 5.5 +/- 0.5 (ForzaTune) or 6–7 (SimRacingSetup) |
| RWD diff — acceleration | 40–60% |
| RWD diff — deceleration | 20–40% |
| Damper bump-to-rebound ratio | Bump ~60–70% of rebound; around two-thirds |
| FH6 tuning menu carryover | Unconfirmed as of May 2026 |
Methodology: How to Approach a Grip Tune
A grip tune is about maximising mechanical traction and chassis balance through corners, not raw straight-line speed. The same loop we use for drift tunes applies here:
- Build first, tune second. Lock the PI build (drivetrain, tires, aero) before touching the tuning sliders. Changing a tire compound or swapping to AWD invalidates every setting below.
- Baseline from a known starting point. Use the ranges in this guide as anchors, not gospel.
- Change one variable at a time. Do a 2–3 lap stint, log what changed, then move on.
- Tune in this order: tires → alignment → springs/ARBs → dampers → differential → aero. This mirrors the order each setting affects the car: contact patch first, then geometry, then weight transfer, then power delivery.
For FH6 specifically (launching 2026-05-19), assume the FH5 tuning menu layout carries over until proven otherwise. The physics model may shift on launch day; treat the numeric baselines below as starting points and rebaseline once community testers publish post-launch tunes.
Tire Pressure for Grip
Tire pressure is the highest-leverage setting on the menu because it changes the contact patch and the rate at which the tire heats up.
| Source | Recommendation | Notes |
|---|---|---|
| ForzaTune (FH5 / FM23) | 32–34 PSI warm | Industry-standard target |
| SimRacingSetup (FH5) | 30–34 PSI cold, then test | Hone on track |
| DiamondLobby (FH5) | 20–25 PSI cold for road racing | Aggressive low-pressure approach |
The community split is real: ForzaTune targets the warm number a real race team would use, while DiamondLobby leans on low cold pressures to bias mechanical grip. As a rule of thumb:
- Higher PSI: more responsive turn-in, higher peak grip, but breaks away suddenly.
- Lower PSI: slower heat-up, more progressive breakaway, more time to catch a slide.
For a first pass, start at 30 PSI front / 30 PSI rear cold in S1/A class, drive 2 laps, then adjust until the car rotates neutrally on entry without snap oversteer on exit. Mark FH6-specific numbers unconfirmed as of May 2026 until launch.
Alignment: Camber, Toe, Caster
Alignment shapes how the contact patch interacts with the road during cornering.
Camber. Run negative camber to compensate for body roll loading the outside edge of the tire. Start around -1.5 to -1.8 degrees front, slightly less rear (e.g. -1.2 to -1.5). Too much negative camber narrows the contact patch on straights and hurts braking.
Toe. Slight toe-out at the front sharpens turn-in; slight toe-in at the rear adds stability. SimRacingSetup recommends 0.1–0.2 degrees toe-out front and 0 to -0.1 degrees toe-in rear. Note ForzaTune warns: “Toe settings cause less predictable results in Forza Horizon 5.” Keep changes small.
Caster. Higher caster increases self-centering and dynamic camber at lock. ForzaTune targets 5.5 +/- 0.5 degrees; SimRacingSetup suggests 6–7 degrees when paired with reduced static camber. Either is a safe start.
Do alignment after pressures because pressure changes affect the dynamic camber the tire actually sees.
Springs, ARBs and Dampers
Suspension settings control weight transfer. For grip on tarmac you generally want stiffer than offroad, softer than circuit motorsport — Horizon roads have crests and elevation changes that punish overly stiff cars.
Springs. Stiffer = more responsive but skips over bumps. Softer = more compliant but can bottom out. Bias slightly stiffer at the rear of FWD cars (to rotate) and slightly stiffer at the front of RWD cars (to control understeer on power). DiamondLobby: “stiffer springs are preferred to give more stability” on road.
Anti-roll bars. ARBs only act mid-corner. To kill understeer, stiffen front ARB or soften rear ARB — never both at once. SimRacingSetup’s base setup recommendation is to “soften your front ARBs to start with and stiffen your rear ARBs a touch” for a neutral platform.
Dampers. Bump controls compression, rebound controls extension. Universal ratio: bump = ~60–70% of rebound (SimRacingSetup) or “around two-thirds” (ForzaTune). Higher rebound at the rear helps put power down on corner exit; higher rebound at the front improves turn-in bite.
Tune order within suspension: springs → ARBs → dampers. Don’t chase oversteer with dampers if the springs are wrong.
Differential for Road Racing
The diff decides how power is split between the driven wheels. For grip tunes you want enough lock to put power down without unloading the inside tire into wheelspin.
RWD baseline (ForzaTune, FM23):
- Acceleration: 40–60%
- Deceleration: 20–40%
Lower acceleration values make the car more willing to rotate but can spin up the inside wheel under power. Higher values hook up better on corner exit but can push the car wide. Start in the middle (50% / 30%) and adjust on a corner you know well.
FWD baseline: Steam/community guides suggest 15–30% acceleration for FWD road tunes — higher values cause torque steer and understeer on exit.
AWD baseline: Front 10–50% accel, rear 50–90% accel, with center diff biased rearward (e.g. 65–75% rear) for grip racing. Mark exact FH6 AWD diff behavior unconfirmed as of May 2026 until launch testing confirms it.
Differential is the last thing to tune before aero. If you change it earlier you’ll mask balance problems that should have been fixed with alignment or suspension.
Grip vs Drift Comparison
| Setting | Grip / Road Racing | Drift |
|---|---|---|
| Tire pressure goal | Max contact patch, progressive breakaway (30–34 PSI warm) | Reduce rear grip, often higher rear PSI |
| Camber front | -1.5 to -1.8 deg | -3 to -5 deg |
| Front ARB | Soften slightly for turn-in | Stiffen to keep front planted |
| Rear ARB | Stiffen slightly for stability | Soften to break rear loose |
| RWD diff accel | 40–60% | Often 100% locked |
| Aero | Max within PI budget | Minimal rear, balance steering |
Frequently Asked Questions
What tire pressure should I run for grip in Forza Horizon?
Start around 30 PSI cold and aim for 32–34 PSI warm, per ForzaTune. DiamondLobby recommends going lower (20–25 PSI cold) for max road grip. Test both and pick the one that gives progressive breakaway, not snap oversteer.
How much negative camber should I run on a grip tune?
Around -1.5 to -1.8 degrees at the front and slightly less at the rear. Going more aggressive narrows the contact patch on straights and hurts braking.
Should I stiffen the front or rear anti-roll bar to fix understeer?
Stiffen the front ARB OR soften the rear ARB — not both at once. ARBs only act mid-corner, so changes won’t affect entry braking or exit traction.
What is the bump-to-rebound ratio for dampers?
Bump should be roughly 60–70% of rebound (SimRacingSetup) or around two-thirds (ForzaTune). This applies front and rear, but the absolute values differ by chassis.
What differential settings work best for RWD road racing?
Per ForzaTune’s Forza Motorsport baseline: 40–60% acceleration and 20–40% deceleration. Start in the middle (50/30) and adjust based on corner-exit traction.
Will FH5 tunes work in Forza Horizon 6?
Unconfirmed as of May 2026 until launch on 2026-05-19. The tuning menu layout will almost certainly carry over, but the underlying physics model may shift. Rebaseline once community testers publish post-launch tunes.